package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.thoughtworks.xstream.XStream;

public class ContactDataGenerator {

	public static void main(String[] args) throws IOException {
		if (args.length < 3) {
			System.out.println("Please specify parameters: <amount of test data> <file> <format>");
			return;
		}
		
		int amount = Integer.parseInt(args[0]);
        File file = new File(args[1]);
        String format = args[2];
        
        if (file.exists()) {
        	System.out.println("File  exists, please remove it manually: "+ file);
			return;
        }
	
        List<ContactData> contacts = generateRandomContacts(amount);
        if ("csv".equals(format)) {
            saveContactsToCsvFile(contacts, file);
        } else if ("xml".equals(format)) {
            saveContactsToXmlFile(contacts, file);
        } else {
            System.out.println("Unknown format" + format);
            return;
        }
               
	}

	private static void saveContactsToXmlFile(List<ContactData> contacts, File file) throws IOException {
		XStream xstream = new XStream();
        xstream.alias("contact", ContactData.class);
        String xml = xstream.toXML(contacts);
        FileWriter writer = new FileWriter(file);
        writer.write(xml);
        writer.close();
	}
	
	public static List<ContactData> loadContactsFromXmlFile(File file) throws IOException {
		XStream xstream = new XStream();
        xstream.alias("contact", ContactData.class);
        return (List<ContactData>) xstream.fromXML(file);
	}

	private static void saveContactsToCsvFile(List<ContactData> contacts, File file) throws IOException {
		FileWriter writer = new FileWriter(file);
        for (ContactData contact : contacts) {
                writer.write(contact.getFirstname() + "," + contact.getLastname()
                                + "," + contact.getAddress() + ","
                                + contact.getAddress2() + "," + contact.getEmail() + ","
                                + contact.getEmail2() + "," + contact.getHometelephone() + ","
                                + contact.getMobiletelephone() + "," + contact.getTelephone2() + ","
                                + contact.getWorktelephone() + ",!" + "\n");
        }
        writer.close();
	}
	
	  public static List<ContactData> loadContactsFromCsvFile(File file) throws IOException {
		  List<ContactData> list = new ArrayList<ContactData>();
		  FileReader reader = new FileReader(file);
		  BufferedReader  bufferedReader = new BufferedReader(reader);
		  String line = bufferedReader.readLine();
		  while (line != null) {
              String[] part = line.split(",");
              ContactData contact = new ContactData().withFirstname(part[0])
                              .withLastname(part[1]).withAddress(part[2])
                              .withAddress2(part[3]).withEmail(part[4])
                              .withEmail2(part[5]).withHometelephone(part[6])
                              .withMobiletelephone(part[7]).withTelephone2(part[8])
                              .withWorktelephone(part[9]);
              list.add(contact);
              line = bufferedReader.readLine();
      }
		  bufferedReader.close();
		  return list;
		}

	public static List<ContactData> generateRandomContacts(int amount) {
		 List<ContactData> list = new ArrayList<ContactData>();
		  for (int i = 0; i < amount; i++) {
			  ContactData contact = new ContactData()
			  .withFirstname(generateRandomString())
			  .withLastname(generateRandomString())
			  .withAddress(generateRandomString())
			  .withHometelephone(generateRandomString())
			  .withMobiletelephone(generateRandomString())
			  .withWorktelephone(generateRandomString())
			  .withEmail(generateRandomString())
			  .withEmail2(generateRandomString())
 			  .withBday("")
              .withBmonth("")
              .withByear(generateRandomYear(1900,2015))
              .withgroup("")
			  .withAddress2(generateRandomString())
			  .withTelephone2(generateRandomString());
			  list.add(contact);
		  }
		  return list;
	}
	
	 public static String generateRandomString() {
		 Random rnd = new Random();
		 if (rnd.nextInt(3) == 0) {
		   return "";
	     } else {
		 return "text" + rnd.nextInt();
	     }
	 }
	 
     public static String generateRandomYear(int start, int end) {
         Random rnd = new Random();
         int interval = end - start;
         int year =  start + rnd.nextInt(interval);
         return Integer.toString(year);
     }

}
